Enhanced triethylamine sensing properties by designing Au@SnO2/MoS2 nanostructure directly on alumina tubes

Autor: Hongyan Xu, Zhengrun Chen, Wenru Li, Zhiwen Qiu, Jieqiang Wang, Ting Zhai, Bingqiang Cao, Huanqin Yu, Xiaopan Song
Rok vydání: 2017
Předmět:
Zdroj: Sensors and Actuators B: Chemical. 253:97-107
ISSN: 0925-4005
DOI: 10.1016/j.snb.2017.05.174
Popis: Two dimensional semiconductors are promising gas sensing materials due to their large surface-to-volume ratio. However, some drawbacks just like low response, long recovery time, and insufficient selectivity limits the development of two dimensional semiconductors gas sensors. In order to optimize the gas sensing properties of MoS 2 sensors, tri-material compound nanostructure of sensing materials is designed and synthesized by depositing Au and SnO 2 nanoparticles on the surface of MoS 2 nanoflowers. Comparing with the pristine MoS 2 sensor, the Au@SnO 2 /MoS 2 sensor exhibits better sensing properties to triethylamine, such as higher sensitivity and faster response/recovery speed. The enhanced sensing properties of Au@SnO 2 /MoS 2 sensor are discussed from the points of Au@SnO 2 Schottky contact and SnO 2 /MoS 2 N-N heterojunction on the basic of depletion layer model. Moreover, MoS 2 nanoflowers are directly grew on Al 2 O 3 tubes via a facile and cost-effective hydrothermal method. And the construction of Au nanoparticles decorated SnO 2 /MoS 2 nanoflowers heterostructure were built by employing the pulsed laser deposition and DC-sputtering methods.
Databáze: OpenAIRE